Research on the Scheme of Covered Excavation Method for Foundation Pit Overcrossing Existing Subway Shield Tunnels
The construction of the covered excavation method over existing subway tunnels will inevitably lead to deformation of the existing tunnel.Based on a deep foundation pit project in Beijing,a three-dimen-sional finite element model was established using ANSYS software to simulate the construction process of the covered excavation method foundation pit.The effects of grouting reinforcement and changes in the parameters of the retaining piles on the deformation of the existing tunnel were discussed.Research has shown that(1)grouting reinforcement can significantly reduce the deformation of existing subway tunnels.(2)The changes in the parameters of the retaining piles have a relatively small impact on the deformation of existing subway tun-nels.
covered excavation method foundation pitsubway tunnelnumerical simulationdeformation lawscheme comparison and selection
万方数据
维普
